Spark-arrester.



LLA. THOMPSN. SPARK ARRESTER. APPLICATION FILED APR.7.1909.

Patented Sept..21, 1909.

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Y stack.

LEWIS A. THOMPSON, OF BUFFALO, NORTH DAKOTA.

SPARK-ARRESTER.

Specification of Letters Patent.

Patented sept. 21, 1909.

Application led April 7, 1909. Serial No. 488,460.

To all whom it may concern:

Be it known I, Lewis A. THOMPSON, a citizen of the United States,residing at Buffalo, in the county of Cass and State of North Dakota,have invented certain new and useful Improvements in Spark-Arresters, ofwhich the following is a specification.

This invention relates to spark arresters and has for its object toprovide a comparatively simple and thoroughly efhcient device of thischaracter, especially designed for attachment to the smoke stacks oftraction engines, steam locomotives and other motors for the purpose ofcatching sparks or incandescent cinders and thus preventing the samefrom causing expensive tires.

A further object of the invention is to provide a spark arresterincluding` a foraminous hood mounted for rotation on the smoke stack andprovided with a vane'for normally holding the open front of said hoodagainst the wind.

A further object of the invention is to generally improve this class ofdevices so as to increase their utility, durability and etlicicncy.

Further objects and advantages will appear in the following description,it being understood that various changes in form, proportions, and minordetails of construction may be resorted to within the scope of theappended claims.

F or a full understanding of the invention, reference is to be had tothe following description and accompanying drawings, in which:

Figure 1 is a vertical sectional View of a spark arrester constructedaccording to my invention, showing same applied to a smoke F ig. 2 is afront elevation of same. Fig. 3 is a transverse sectional view taken onthe line 3*?) of Fig. 2 and looking in the direction of the arrow.

Corresponding and like parts are referred to in the followingdescription and indicated in all views of the accompanying drawings bythe same reference characters.

The spark arrester forming the subject matter of the present inventioncomprises a supporting frame including an annular band 5 to which arebolted or otherwise rigidly secured intersecting bars 6 and 7.

The free ends of the bars 6 and 7 are curved downwardly and inwardlywith their terminals spaced apart to form anopening for the reception ofthe smoke stack indil l i l cated at 8. The upper portions of the bars 6and 7 are covered with a strip of wire netting or other foraminousmaterial 9 to form a hood l() which latter serves to prevent the sparksor incandescent cinders emitted from the smoke stack from being spreadbroadcast by the action of the wind and thus causing extensive fires. A.strip of wire gauze or similar material is also secured to the lowercurved terminals of the bars 6 and 7 to form a shield or pocket 11 whichholds the cinders or sparks and prevents the same from falling on theground.

The forward portion of the central supporting ring or band 5is'dcfiected upwardly at 12 while the wire forming the shield or pocket1l preferably terminates at the base of the deflected portion 12 therebyforming an ooenincr 13 to errnitv the assaGe of air l e lO e to thelsmoke stack in order to create the necessary draft for the engine.

Secured to the bars 6 and 7 at their points of intersection is a disk 14one edge of which is bent downwardly t0 form a depending lip ordeiiector 15 which serves to direct the sparks or cinders coming inContact with the disk laterally within the pocket 11 and thus preventthe same from passing through the opening 13, as will be readilyunderstood.

The perforated hood is retained in position on the smoke stack 8 bymeans of a spider 16 the arms of which bear against the exterior wall ofthe smoke stack and are rigidly secured thereto by bolts or similarfastening devices 17. The central portion of the spider has a verticalopening for the reception of a bolt or pin 18 which extends throughcorresponding openings formed in the disk 14C and intersecting bars 6and 7 and is provided with terminal threads for engagement with aclamping nut 19, there being a sleeve or collar 20 interposed betweenthe intersecting disk 1/1 and the nut 19 for the purpose of retainingthe parts in assembled position while at the same time permitting freerotation of the hood on the smoke stack.

Secured to the inner curved terminal of the bars 6 and 7 arecorrespondingly curved fingers-21 having elongated slots 22 formedtherein for the reception of the clamping bolts 23 carried by theadjacent terminals of the bars 6 and 7 there being rollers 24 journaledon the free ends of the fingers 21 and adapted to bear against theexterior wall of the smoke stack to prevent friction lli) between theparts when the hood is rotated. Thus it will be seen that by releasing.the nuts 25 the lingers 2l may be adjusted lon gitudinally of theadjacent bars 6 and' 7 so as to regulate the position of the rollers 24with respect to the smoke stack and thus permit the hood to be used onsmoke stacks of different sizes.

Disposed at right angles to the plane of the hood is a vane 26 whichserves to normally hold the open front of the -hood against the wind soas to permit the entrance of air and thus assist in creating a draft inthe smoke stack. The vane 2G is rigidly combined with the hood by meansof spaced diverging braces 27, one end of each of which is secured tothe vane while the diverging ends thereof are disposed on opposite endsof the side of the pivot pin or bolt 18 and are secured to the adjacentportions of the bar 7 in any suitable manner. A vertically disposed bar28 is also preferably extended from the band 5 to the inner end of thevane for the purpose of reinforcing and strengthening` the whole. Thusit will be seen that the open end of the hood is always held against thewind by the vane 26 while the sparks or incandescent cinders dischargedat the mout-h of the smoke stack will come in contact wit-h the curvedwalls of the hood and be deflected downwardly into the pocket or shield11, the cinders at the forward portion of the hood being prevented fromdropping through the opening 13 by the depending lip or deflector l5 inthe manner before stated. The spark arresters may be made in differentsizes and shapes and provided with any number of rollers for reducingthe friction between the hood and smoke stack.

Having thus described my invention, what I claim as new, is:

1. The combination with a smoke stack, of a foraminous hood mounted forrotation on the smoke stack and having one side thereof open, a vanecarried by the hood for normally holding the open side of the hoodagainst the wind, longitudinally adjustable fingers secured to the hoodand anti-friction rollers journaled on the lingers and adapted to bearagainst the exterior wall of the smoke stack.

Q. The combination with a smoke stack, of a foraminous hood mounted forrotation on the smoke stack having` one side thereof open, a deflectorcarried by the hood and having a depending lip for preventing thedischarge of cinders through the opening in said hood, longitudinallyadjustable fingers carried by the hood, and rollers ournaled on the endsof the fingers and arranged to bear against the exterior wall of thesmoke stack.

3. The combination with a smoke stack, a spider secured to the smokestack, a hood pivotally connected with the spider .and mounted forrotation on the exterior wall of the smoke stack, said hood beingprovided with an opening, a vane carried by the hood for normallyholding the open side thereof against the wind, fingers slidably mountedon the hood and anti-friction rollers carried by the fingers and adaptedto bear against the exterior wall of the smoke stack.

il. The combination with a smoke stack, of a spider detachably securedto the stack, a hood mounted for rotation on the stack at the upper endthereof, a fastening device forming a pivotal connection between thespider and hood, a disk interposed between the spider and hood andhaving a depending portion constituting a deflector, longitudinallyadjustable fingers secured to the hood', and anti-frictional rollersjournaled to the fingers and adapted to bear against the exterior wallof the stack, said hood being open on one side and provided with a vanefor normally holding the open side thereof against the wind. Y

The combination with a smoke stack, of a hood mounted for rotation onthe smoke stack, and comprising a supporting frame having its upperportion covered with a strip of foraminons material and its lowerportion covered with a strip of similar materia-l to form a pocket orshield, a portion of the frame being deiiected upwardly and spaced fromthe shield to produce an opening, a vane'carried by the hood fornormally holding the open end of the hood against the wind,longitudinally adjustable fingers secured to the hood, and anti-frictionrollers journaled to the fingers and adapted to bear against theexterior walls of the stack.

6. The combination with a smoke stack having a spider detachably securedthereto, of a hood bearing againstthe spider and mounted for rotation onsaid stack, said hood including a frame comprising an intermediateannular supporting member connected by intersecting bars, longitudinallyslotted fingers secured to the terminals of said bars, anti-frictionrollers journaled on the fingers and adapted to bear against the stack,a foraminous cover secured to the supporting band and intersectingbars,a portion of the intermediate supporting band being deflected upwardlyand spaced from the stack to form an opening, a vane carried by the hoodfor normally holding the open end of the hood aga-inst the wind, andbraces forming a connection between the vane and hood.

Tn testimony whereof I affix my signature in presence of two witnesses.

LEWIS A. THOMPSON. [Ls] lVitnesses MARTIN HALvonso'N,

J. E. KRI'NGLER.

